Description

把一个字符串中所有出现的大写字母都替换成小写字母，同时把小写字母替换成大写字母。

Input Format

输入一行：待互换的字符串。

Output Format

输出一行：完成互换的字符串（字符串长度小于80）。

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iF SO, YOU ALREADY HAVE A gOOGLE aCCOUNT. yOU CAN SIGN IN ON THE RIGHT. 

Source

计算概论05